The things you stumble across in RetractionWatch. Remember this cool bit of amber with something avian in it? The paper has been retracted by Nature, but not due to fraud:
We, the authors, are retracting this Article to prevent inaccurate information from remaining in the literature. Although the description of Oculudentavis khaungraae remains accurate, a new unpublished specimen casts doubts upon our hypothesis regarding the phylogenetic position of HPG-15-3.